package Java8.optional;

import java.util.Optional;

public class TestOptional {

    public Optional<String> findMyPhone(int phoneId) {
        return phoneId == 10
            ? Optional.of("MyCheapPhone")
            : Optional.empty();
    }

    public String buyNewExpensivePhone() {
        System.out.println("\tGoing to a very far store to buy a new expensive phone");
        return "NewExpensivePhone";
    }


    public static void main(String[] args) {
        TestOptional test = new TestOptional();
        String phone;
        System.out.println("------------- Scenario 1 - orElse() --------------------");
        System.out.println("  1.1. Optional.isPresent() == true");
        phone = test.findMyPhone(10).orElse(test.buyNewExpensivePhone());
        System.out.println("\tUsed phone: " + phone + "\n");

        System.out.println("  1.2. Optional.isPresent() == false");
        phone = test.findMyPhone(-1).orElse(test.buyNewExpensivePhone());
        System.out.println("\tUsed phone: " + phone + "\n");

        System.out.println("------------- Scenario 2 - orElseGet() --------------------");
        System.out.println("  2.1. Optional.isPresent() == true");
        // Can be written as test::buyNewExpensivePhone
        phone = test.findMyPhone(10).orElseGet(() -> test.buyNewExpensivePhone());
        System.out.println("\tUsed phone: " + phone + "\n");

        System.out.println("  2.2. Optional.isPresent() == false");
        //phone = test.findMyPhone(-1).orElseGet(() -> test.buyNewExpensivePhone());
        phone = test.findMyPhone(-1).orElseGet(() -> null);
        System.out.println("\tUsed phone222: " + phone + "\n");
    }
}
